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How is __INFINITY__ defined in arm_15.12.3.LTS for C++

I'm migrating to a newer compiler from an older compiler version (older version 5.1.7).  I had been using the INFINITY macro, which in arm_15.12.3.LTS is defined as __INFINITY__.  That being said, I can't find where __INFINITY__ is actually defined.  Is __INFINITY__ an intrinsic value?  If so, what is the intrinsic value in arm_15.12.3.LTS?